Abstract: Syftet med projektet PRIMO är att ta fram en metod för att kunna omvandla differentierade biljettpriser till taxor som kan implementeras i storskaliga modeller såsom Sampers, med hänsyn taget till variationen i prisernaAbstract: The aim of the project is to develop a method that turns the differentiated prices offered to the travellers into fares suitable for implementation in a large-scale model such as Sampers, taking into account the variation in fares. This improvement would contribute substantially to improving the accuracy and credibility of the forecats made by Sampers and would open the possibility of improving Sampers itself in future by estimating more accurate cost coefficients